Chapter 1 Introduction
6
OL-31980-01
Disaster Recovery
In the event of a transmission failure on the primary feed, the disaster recovery
allows for continued programming, with limited to no downtime. The failure
condition could be triggered by one of the following events:
RF Lock Loss
Unstable RF signal
Transport Loss (RF locked, but no transport stream packets and NULL packets
received)
Once the receiver detects a failure after the configured timeout, it will initiate a
disaster recovery search based on the search path determined by the disaster
recovery configuration. A DR symbol is displayed on the front panel, and the D9859
web GUI displays a D/R in progress status. During a disaster, the receiver will
attempt to tune to a different backup transport, based on the search path configured.
The origin transport consists of origin transport tuning parameters and PE service
IDs, configured in the Input menus. For more information on the Input parameters,
see
RF1, RF2, RF3, RF4 (RFx) Input
(on page 63) for the front panel, and
Setting up
the RF Input
(on page 141) for the web GUI.
Note:
If you perform a master PE channel change during a disaster recovery search,
the search will end, the current tuning parameters will be locked, and the current
channel will become the origin channel. If you perform a tuning change during a
disaster recovery search, the search will end, the current user tuning parameters will
become the origin tuning parameters, and the origin may be updated by any of the
NIT updates that follow.
For example, the disaster recovery is configured as follows:
Program
Entry
Origin Transport
Channel Number
Backup 1
Transport
Channel
Number
Backup 2
Transport
Channel
Number
Backup 3
Transport
Channel
Number
PE1
101
11
101
801
PE2
2
12
1005
When disaster occurs, the receiver will tune to channel 11, as defined on the Backup
1 transport.
If the acquisition is successful on the Backup 1 transport (PAT is received), the
receiver will set PE 1 to channel 11 and PE2 to channel 12 and declare t hat the
disaster is over.
